Layered array Al2O3-LuAG: Ce composite ceramic phosphors for high-brightness display

Thermally robust and efficient composite ceramic phosphors (CCPs) combined both the merits of matrix and phosphor have received growing interests. However, high matrix content (e.g., Al₂O₃ >40 wt%) brings diluted activated ion concentration and dropped photoluminescence (PL) quantum yield (QY). Here, a novel layered array Al₂O₃-LuAG: Ce CCP, where Al₂O₃ and LuAG: Ce thin layers (10–250 µm) are alternately arranged, was presented. Owing to the special structure, thermal phonons and photons are respectively routed into Al₂O₃ layers and LuAG: Ce layers, which weakens the influence of Al₂O₃ and heat accumulation on PL properties. Consequently, it exhibits high PLQY (84.1%) and good thermal conductivity (17.1 W·m^?1·K^?1). When it is irradiated under high-power density (27.2 W·mm^?2) blue laser, the luminous efficiency and lumen-density are promoted to 220 lm·W^?1 and 5994 lm·mm^?2, respectively. This work provides a promising new microstructure in developing novel phosphor converters for high-brightness laser phosphor display.     

循环冷却海水对碳钢的腐蚀与缓蚀剂的开发研究

分析了海水成分对碳钢腐蚀的影响,论述了海水对碳钢的腐蚀机理及腐蚀的控制方法.在循环冷却用海水中投加缓蚀剂是一种减缓碳钢腐蚀的经济有效的方法,并探讨了缓蚀剂的缓蚀机理.阐述了从单纯高效到环境友好型高效缓蚀剂的转变历程,展望了缓蚀剂的开发利用.     

A Wear Detection Parameter for the Wheel–Rail Contact Based on Emitted Noise

This article describes how a wheel–rail wear detection parameter based on noise was developed by running a rapid transit train instrumented with microphones in a depot with a small curve radius. This full-scale test made use of previous knowledge gained from lab-scale tests. The lab- and full-scale tests showed that noise could be used as an indicator of wear transition, when normal wear turns into severe or catastrophic wear. This transition was accompanied by a significant increase in sound pressure and a broader sound pressure amplitude spectrum; that is, a narrow initial amplitude distribution in the normal wear regime and a broader distribution in the severe wear regime. The measured noise from the inner/low and outer/high rails was analyzed in conjunction with the wear from the outer wheel and comparisons were made between cleaned (exposed to severe wear) and lubricated (no wear) rail. Based on those analyses, a wear detection parameter criterion was developed for this specific train. This wear parameter has been implemented in a real-time condition monitoring system so that warnings of the risk for severe wear could be sent to the maintenance department. Validation of the wear parameter and challenges linked to open system conditions are discussed in this article.     

Nanoindentation and scratch behaviour of Ni–P electroless coatings

ABSTRACT

In the present paper, the mechanical properties and the scratch failure mechanisms of Ni–P electroless coatings are described. The material microstructure was studied in as-deposited and annealed conditions through SEM and EDS analyses. Nanoindentation measurements on the coatings showed a remarkable hardening due to the crystallization and precipitation behaviour produced by annealing. The scratch tests, conducted by increasing the load during scratch, revealed the coating failure mechanisms in a broad range of applied stresses up to delamination.     

城市应急避难场所与城市绿地建设结合途径的探讨

从中国城市绿地与应急避难场所的设计和建设特点入手，结合中国城市绿地的实际情况，分析了两者结合的可能性和优劣势，并探讨了适应中国城市发展的城市绿地与应急避难场所相结合的原则及设计方式。提出两者建设结合应遵循统筹规划、安全优先、平灾结合、改建结合的4大原则，并对系统分类、空间布局、交通布局、地形设计及利用、内部设施利用、植物种植等结合途径进行探讨，为城市应急避难绿地的研究和建设提供参考。     

绿色建筑设计中对具有数据中心的两栋办公楼的能量建模分析

EnergyPlus是为上海研发中心的两栋办公楼开发的能量模拟模型,用来评估其采用环保设计之后节能效果,并与基准建筑相对比。作为国际IT公司的研发中心,这两栋楼中具有数据中心,使其不同于一般办公楼。数据中心的IT设备具有高能耗特点,并且需要24h不间断的空调运行。为了达到节能目的,设计时考虑了多种节能措施,如外墙采用高性能材料、轻型建筑系统和HVAC系统。通过能量模型,将提出的设计方式与ASHRAE90·1-2004 compliant budget模型进行对比,以强调与"应用标准"相比之下的节能效果,同时显示了潜在的LEED(tm)Credit EA1节能优化性能。同时,将其与中国规范对比,计算中国公共建筑节能标准中的节能量。整体房屋能量模拟结果显示:这种设计方式下的年均节能,按中国规范能达到大概27%,按ASHRAE建筑预算可节省21%,由于节能优化,可达到LEED信用4级。     

古老神秘的异域国度多姿多彩的亲身经历--赴中东也门共和国短期工作回顾

阐述了作者赴也门首都萨那市短期工作的性质、内容和成果，分析了萨那市的城市环境情况、人文历史情况，并针对这些情况，结合具体的单个项目设计，提出了一些建议和想法。     

我国绿色交通研究综述

本文通过对1994年至今的与绿色交通相关的文献进行总结、评述,概括介绍了绿色交通的缘起、内涵,对国内绿色交通的研究现状进行了分类总结,指出了目前绿色交通研究中存在的不足,对将来的理论和现状研究提出了相应的建议。     

Optimal tree design for daylighting in residential buildings

Urban reforestation is advocated as an efficient countermeasure to the intensification of urban heat islands. The greening and beautification of residential quarters is one of the main concerns of residents, while lighting and ventilation are two main energy-consuming building services. Hence, the tree layout in green space between buildings is important, and it is necessary to determine the relationships between trees and buildings. This study takes Shanghai as a case study to optimize tree design between residential buildings and meet good daylighting requirements. Models were made using software such as AutoCAD and SketchUp. The relationships between maximum tree height and building separation were determined. For the same building layout, there were different tree height limits according to crown shape; the order of decreasing height limits was cylindrical, conical, spherical, and inverted conical crowns. Three cases having different green space between building layouts were studied. Their maximum tree heights differed. Overall, our model helps us realize good daylighting of a building environment. The formula allows us to determine which trees to plant between buildings in that we can predict the effects of future tree growth on building daylighting.     

生物滞留系统对城市公路径流的治理作用 有无内部蓄水层设计的对比研究

研究评价了两种生物滞留系统对于综合公路径流的治理作用。该实验位于炎热干旱的德州布赖恩市德州农工大学（TAMU）河滨校区,实验者制作了5个大型的生态滞留装置,以便于在底部形成61cm深的内部蓄水（IWS）层,分别对有无内部蓄水层设计的生物滞留系统进行了模拟真实径流水量和水质的合成公路径流测试。比较结果表明,内部蓄水（IWS）层能减少洪峰流量、延长径流滞留时间,同时还显著提高了对铜、悬浮固体以及氮和磷的去除效果。尽管内部蓄水层改善了公路径流的治理,但在炎热干旱地区使用内部蓄水层持水仍面临巨大挑战,因为大量的水会通过蒸发而散失掉。接下来的研究需要制定关于内部蓄水层在炎热干旱地区应用的进一步方针。